Luxman 5 k 50M Service Manual

Page 2

SKSOM

ALIGNMENTPROCEDURE

HEADS HEIGHT ADJUSTMENT'& AZIMDTH'ADJUSTMENT
1. Load the test tape and-check the tape transport mechanism
(A0 At 'Play' position, check that tape is not curled by two tape guides
fitted with Erase & Playback Heads.
(3) Adjust heads' height to eljndnate shift of tape to make tape
horizontal by repetition of 'Play' and 'Stop' actions.
(C) Provisionallyadjust azimuth and tilt of Playback head to obtain
the highest level of output of both 333R: and lOKHz signal recorded

in the tape.

2. Load the test tape, MITelSOCéOOHz ZOOnW/m), and adjust Playback Head to
obtain the max. level of output, and at the same time, adjust to make
waveforms of L & R channels in phase.

3. Load test tape MIT-114(10KH2 -lOdB), and check that the output level is
at max, and that the waveforms of L and R channels are in phase. Set
the other side of the tape up, and adjust azimuth and tilt alternately so
that both max. output level and waveforms in phase between L and R
channels can be obtained.

4. After the above adjustment, check to»get proper tape transport adjusted
as a final step by the lst test tape.

P/B AMP DC BALANCE ADJ.

Connect either of the oscilloscope, DC VTVM and multimeter to the test
points,_H.Tpl C TpZ for L ch., E Tp4 C Tp3 for R ch. on P/B AMP PC Board,
and adjust the semifixed resistors, RiOla, RTOlB to obtain drift within.
+50mY from the centre of meterneedle. Remember that the final DC balance
adjustment is required after all the above-mentioned adjustments.

P/B EQAMP LEVEL'ADJ; CIAPEPOSITIONS)

Load the test tape MIT-150(400Hz ZOOnW/m), and adjust the semifixed resistors,
RIOBa, 81036 on the P/B AMP PCB,-to oBtain. S75mVat Dolby PC board terminal
8(7) for L ch. and 4(3) for R ch. respectively, while setting at 'Tape-
Monitor' position. Also check that the output level is at approximately
517mV while making the above adjustment.

METER ADJ.
After PB level adjustment, adjust the semifixed resistors RTOla, RTOlb on

the SW PC board to obtain OdB display at the bar-graph peak level meter:
Turn RIOla, RIOlb first to A position to obtain ~ldB display, and then

at the B position to obtain +1d3 display, and finally turn both RTOla, RIOlb
in the midway between A and B positions to obtain the precise OdB display.

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P/B EQ FREQflENCY ADJ.

Load the test tape, t ~216(3180m5 + 120u5), and adjust the semifixed
resistors, RIOZa, RTOZb on the P/B PC board to obtain frequenCy response
in the range of 31. SH: - lhKHz within +3dB. Moreover, adjust the variable
resistors to reach the deviation within 0~+ldB at lOKHz, and within

+1~+2dB at léKHz.

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